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CVE-2026-43494 (GCVE-0-2026-43494)

Vulnerability from cvelistv5 – Published: 2026-05-21 10:49 – Updated: 2026-08-05 12:28
VLAI
Title
net/rds: reset op_nents when zerocopy page pin fails
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-1341 - Multiple Releases of Same Resource or Handle
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < c6e51512a784c4a7b86e1a044988696e3b3721fa (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 03014551938a0887fa55f18ce49b70158a9c0113 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < d84ce1786ce40fdd3dd98db47aec5527817e1ef6 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 9115669faedccdda100428e2d26fd0aac8c50799 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 0bbbff00a15b1df2cac9014d6cf4b6890f473353 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 640e37f58f991546a87540d067279c2c1fa9fe51 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 290e833d1acb1093bc121fcdc97f5e6161157479 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < e174929793195e0cd6a4adb0cad731b39f9019b4 (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/rds: restablecer op_nents cuando falla el anclaje de p\u00e1gina de copia cero\n\nCuando iov_iter_get_pages2() falla en rds_message_zcopy_from_user(), las p\u00e1ginas ancladas se liberan con put_page(), y rm-\u003edata.op_mmp_znotifier se borra. Pero no logramos borrar correctamente rm-\u003edata.op_nents.\n\nM\u00e1s tarde, cuando se llama a rds_message_purge() desde rds_sendmsg(), el bucle de limpieza itera sobre el n\u00famero incorrectamente no cero de op_nents y los libera de nuevo.\n\nSolucionar esto restableciendo correctamente op_nents cuando deber\u00eda ser en rds_message_zcopy_from_user()."
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      "cve": "CVE-2026-43494",
      "id": "CVE-2026-43494",
      "initial_release_date": "2026-05-21T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/rds: reset op_nents when zerocopy page pin fails",
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      "current_release_date": "2026-08-31T17:03:23Z",
      "cve": "CVE-2026-43494",
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      "product_status:first_fixed": "2",
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      "product_status:recommended": "668",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43494",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43494.json",
      "version": "26"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.